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TLE4942C

Differential Two-Wire Hall Effect Sensor IC

Infineon Technologies 

TLE4942, TLE4942C

I

Xn

IHigh

Xn+1

Xn+2

ILow

t

1

T

duty = t1 / T * 100%

t

Figure 7 Definition of duty cycle

PWM Current Interface

Between each magnetic transition and the rising edge of the corresponding output

pulse the output current is Low for tpre-low in order to allow reliable internal

conveyance. Following the signal pulse (current is High) is output.

If the magnetic differential field exceeds ∆BEL, the output pulse lengths are 90µs or

180µs respectively, depending on the direction of rotation.

When the magnitude of the magnetic differential field is below ∆BEL, the output pulse

lengths are 360µs and 720µs respectively, depending on left or right rotation. Due to

decreasing cycle times at higher frequencies, these longer pulses are only output up

to frequencies of approximately 117Hz. For higher frequencies and differential

magnetic fields below ∆BEL, the output pulse lengths are 90µs or 180µs respectively.

If the magnitude of the magnetic differential field is below ∆BWarning, the output pulse

length is 45µs. The warning output is dominant, this means that close to the limit

airgap the direction and the assembly position information are disabled.

For magnitudes of the magnetic differential field below ∆BLimit, signal is lost.

In case no magnetic differential signal is detected for a time longer than the stand still

period Tstop, the stop pulse is output. Typically with the first output stop pulse, the

circuitry reverts to the uncalibrated mode.

TLE4942 - TLE4942C Data Sheet

12

February 2002

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